Abstract:

In mountainous region,debrisflow bottomland is a precious soil resource with wide and flat terrain,good hydrothermal condition and greatly potential land productivity.Therefore,the exploitation and utilization of debrisflow bottomland for agricultural development can help to improve the status of socioeconomy and ecoenvironment.In this paper，on the base of field investigation,experimental analysis and RS and GIS technologies,the principles and basis for reclaiming agriculture from debrisflow bottomland were expounded on systematically,an equation of the relationship between human and livestock consumption and bottomland yield was established,the socioeconomic and ecological benefits of developing debrisflow bottomland were calculated and countermeasures of agricultural development from debrisflow bottomland  were explored through a case of Jiangjia Gually in the upper reaches of Xiaojiang Basin.From this research,the following results and conclusions are got:(1) the established equation can effectively assess the socioeconomic and ecological benefits of reclaiming agriculture from debrisflow bottomland and reflect the ecoenvironmental characteristics of a certain valley;(2) the debrisflow bottom of Jiangjia Gully can yield more than 5 million Yuan economic benefits of agriculture every year,which can provide 338 tons of marketable grain production except for producing grain to feed 6 418 persons of the whole valley,so it is an important approach to develop rural socioeconomy in the impoverished region by exploiting and utilizing the debrisflow land for agriculture;(3) it is necessary to comprehensively exploit and utilize the bottomland of debrisflow area for agricultural development,as well as to strengthen debrisflow disaster prevention and control and enhance consciousness of disaster prevention and mitigation.

Key words: debrisflow bottomland/agriculture development/balance between land yield and human and livestock consumption/Jiangjia Gully